Insulating and supporting washers for electrical binding posts



July 7, 1931. c. H. THoRDARsoN INSULATING AND SUPPORTING WASHERS FOR ELECTRICAL BINDING POSTS Filed Feb. 24, 19:50

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. |NvENToR BY mq r m7 ATTJRNEYJ' Patented July, 7, 1931 CHESTER-H. THORDAIB'SONQOF CHICAYGO, ILLINOIS, ASSIGNOBIIO `THOZB'DABSON ELEC- 'rnro MANUFACTURING co., or carcasa,

ILLINOIS, .A CORPORATION OF ILLINOIS msULATING nNnsUPPoB'rING wAsHEns 'ron ELECTRCAL (BINDING roars Application ledf 4February 24, 1930. Serial No. 430,844.

This invention relates to improvements in4 means for supporting insulating electrical posts and like conductin elements from themetal wall of a casing or an electrical device at outlet openings through which said binding posts extend, and refers also to a novel arrangementI of gang ywashers for insulating and-supporting a plurality of such binding posts, 'and to a novel washer for such use. l i

The invention consists in the combination and arrangement of the parts shown in the drawings and described in the specification,l

washer 16so as'y to thereby afford a nonand is pointed out in the appended claims.

The invention is herein shown as adapted to a casing for containing a transformer of that type wherein the -secondary is provided with a' number of taps or terminals, and in such construction three or more of. 'such binding posts are employed. The invention is capable, however, of4 adaptation to a lesser. number of binding posts.l

In the drawings:

Figure 1 is a plan view /of a transformen` casing, partially broken away, to show the adaptation of my invention thereto;

f Fig. 2 is an inside view of the casing wall and the inside washer and associated parts; Fig. 3 is a horizontal section on -the line 3-3 of Fig. 2;

Fig. 4 is a perspective view of one of the gang washers; and A Fig. 5 is a fragmentary longitudinal section of one of the washers.

As shown in the drawings, 10 designates the casing of a transformer; 11, 12 the insulating bushings through which the confA ductors of the primary circuit are led into the casing, and 13, 13, 14 designate binding posts which extend through openings in the metal wall 15 of the caslng for connection with internal and external conductors. 16, '17 designate inner and outer gang washers which are applied, respectively to the inner and outer faces of .the Y casing wall 15, through which the bindingposts extend. Said washers are made of any suitable insulating material, such as libre, and are substantially thicker than the pierced wall 15'of the casing. 1

Each ofv said washers comprises an elongated strip of insulating material which is formed with a-pluralit of openings 19 for the passage of the bin ing posts .13, 14, the openings 19 .of the inner and outer washers registering with each other and with the out-I let openings in the casing wall .15; The' openings for one or both of the gang washers are rectangular or made otherwise noncircular, to receive the inner squared or non` circular Shanks 20 of vthe bindingpostsjust inside `the heads 21 thereof, which heads lie y inside andengage the'inner face' of the inner with or s ightly beyond the 'outer vface of the casing wall 15.` -TheV outer gang washer 17 is formed on its inner side around the openings 19 therein with like bosses 23 that are aligned with and abut, against the bosses of the inner washer. The said bosses and resultant shallow recesses of the inner and outer washers can be formed by a suitable stamping or embossing operation by the same-dieswhich cut and form the washers and form the openings therein. IBy reason of the fact that the said bosses of the inner and outer gang washers are aligned and abut against each other at said openings inV the casing wall, pressure applied through the clamping nuts 22 serve to somewhat deform` said bos's ends, thus intimately pressing them together and closely iilling or lining. the openings 'in the casing wall to afford good insulation between the binding-posts and the' metal casing wall at said binding post openings. The 'said abutting bosses also serve to center the binding posts in said openings and thus further -insure eilicient casing Wall.

' forated casing wall which prevents transf verse and longitudinal displacement o f the washers, thus insuring niaintainingcentralization ofl the binding posts '1n-said casing wall openings. Y Y

An advantage of the gang washer de, scribed, in addition to -those mentioned, lies in the facility by which the washersI may be assembled on the casing wall and the binding pos assembled to clamp the-washers in place, due to the one piece structure of the washers. Moreover, the openings of the casing wall and the bosses are equidis- .tantly spaced, so that the washers maybe readily assembled on the wall without're gard to the endwise disposition of the wasn.-

I ers, as will be evident., The structure also with said leads.

has the eil'ect 4of materially stiifenin'g the casing wall and of producing a very rigid and elongated support for the binding posts, in addition to the insulating properties of said washers. y I

The lead wiresfrom-the secondary may d be connected to the binding posts 13, 14

through the medium of U-shaped clips 26, the forward arms ofwhichare apertured to interlockingly fit over the squared' Shanks of said posts between the heads thereof and the inner washer, and the rear members .ofc which are formed for electrical attachment The forward members of at adjacent sides of the washers with lbosses that abut at the member perforations, each of said washers being composed of a mechanically stiff flat strip of insulating material, binding pdsts extending through said washer openings land bossesand sald member perforations, and clamplng means associated with said posts and acting on the Y washers to force the abutting bosses together.

2. TheA combination with a perforated metallic member, of mechanically, strong stiil' insulating and binding post supporting gang washers -itted to the opposite sides of said member and havingv longitudinally .spaced openings and provided Atherearound '80;

at adjacent sides of the washers with bosses that endwise abut at the member perfora-4 tions, binding posts extending through said Washer openings andbosses and said member openings, and clampin to force the abutting bosses together.

means associated ,-85 with said posts and a'ctmg on the Washersl 3. The combination with a perforated y i metallic member, 'of insulating and binding post supporting gang washers fitted to the' opposite sides of said memberl and having longitudinally spaced openings and prof vided therearound at ad]acent.sides of the washers with bosses that abutat the -mem-y ber perforations, each washer consisting oi a flat stiff mechanicall strong strip, headed binding postsextending through the bosses and the'perforations of said member, and clamping nuts threaded on said posts.

In testimony whereof I have hereunto set LCHESTER H. THORDARSON.

the U-shaped clips thus formed and arranged with respect to the headed ends of the bindin posts insure that the said terminals will firmly clamped between said heads and the inner gang washer.

It will be understood that the insulating Y' and supporting means for the binding posts described may be employed for other uses than-that shown and specifically described,

my hand on this 18th day 0f February A- De inner side can in some instance be made of individual perforated pieces insteadof an integral one-piece member, as shown.

.0 e I claim as my invention:

1. The combination with la, perforated metallic'member, of insulating and bindingV .post supporting gang washers fitted to the opposite sides of said member and having spaced openings and provided therearound 'ias 

